CN102622139A - Strong sunshine interference-resisting method for infrared touch screen - Google Patents
Strong sunshine interference-resisting method for infrared touch screen Download PDFInfo
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- CN102622139A CN102622139A CN2012100564378A CN201210056437A CN102622139A CN 102622139 A CN102622139 A CN 102622139A CN 2012100564378 A CN2012100564378 A CN 2012100564378A CN 201210056437 A CN201210056437 A CN 201210056437A CN 102622139 A CN102622139 A CN 102622139A
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Abstract
The invention provides a strong sunshine interference-resisting method for an infrared touch screen. The method is characterized in that the left side and the right side or the left side and the right side and the upper side and the lower side of the infrared touch screen are simultaneously provided with infrared transmitting tubes and infrared receiving tubes, and the infrared transmitting tubes and the infrared receiving tubes are arranged with one another in an intersecting way; the infrared transmitting tubes which are arranged at the left side and the right side or the upper side and the lower side and the opposite infrared receiving tubes are taken as one group, and the infrared receiving tubes which are arranged at the same side and the opposite infrared transmitting tubes are taken as another group of circuits; and the degree of sunlight interference is judged according to the intensity of a strong sunshine interference signal detected by the working infrared receiving tubes which are arranged at one side, and when the normal work of the touch screen is affirmed to be interfaced and influenced by the sunshine, another group of touch screen work circuits can be automatically switched, so that the perpendicular incidence of the sunshine can be avoided. The method has a simple principle, and does not need a complex circuit detecting and processing technology, so that the perpendicular incidence of the sunshine at all angles and the scattering of the environment light caused by the perpendicular incidence of the sunshine can be effectively avoided, and the invalidation or the misoperation of the infrared touch screen can be avoided.
Description
Technical field
The present invention relates to a kind of touch screen technology, the method that especially a kind of anti-extraneous light of infrared touch panel disturbs.Specifically a kind of be applied to the strong sunlight direct projection and around the method for anti-strong sunlight interference of sunlight scattering environments infrared touch panel down.
Background technology
At present, infrared touch panel has been applied to various media, recreation, multimedia teaching, aircraft, Vehicle Engineering and has controled etc.Because infrared touch panel is that the infrared light with certain wavelength is an actuating medium; Transmit and receive correspondence or one-to-many manner work one by one; After when touching, having blocked the part IR, X, Y can differentiate touch point position to infrared receiving tube and sweep circuit thereof in length and breadth, play the effect of touch-screen; The predominant wavelength of general infrared transmitting tube be 850nm to 1040nm, sensitive range 770 nm of infrared receiving tube are to 1200nm (S=10%S
MAX); Because contain very strong infrared light composition in the sunlight, wavelength coverage has comprised the sensitive wave length of infrared receiving tube, (770 nm are to the about 20～80W/m of 1200nm wave band for direct radiation intensity
2) extreme infrared power valve far away is radiated the intensity (particularly large scale touch-screen) in the infrared receiving tube position, so the problem that has a lot of patented methods reduction strong sunlights to disturb, but all can not solve the problem of full angle sunlight direct projection fully.
Summary of the invention
The objective of the invention is can not solve the problem of full angle sunlight direct projection fully to existing infrared touch panel anti-interference method, invent a kind of can satisfy the strong sunlight direct projection and around the sunlight scattering environments can make the method for anti-strong sunlight interference of the infrared touch panel of infrared touch panel operate as normal down.
Technical scheme of the present invention is:
The method that a kind of anti-strong sunlight of infrared touch panel disturbs is characterized in that it may further comprise the steps:
A, in the left and right sides of infrared touch panel or the left and right sides and up and down both sides arrange many infrared transmitting tubes and infrared receiving tube simultaneously, both are staggered;
B, the left and right sides or up and down the infrared receiving tube on any side infrared transmitting tube and the corresponding opposite of both sides as one group of touch-screen operating circuit; The infrared receiving tube of homonymy is organized touch-screen operating circuit operation detection touch signal respectively with the infrared transmitting tube on corresponding opposite as another; Differentiate touch point position, accomplish the touch measuring ability of infrared touch panel in conjunction with touch screen control circuit;
The detected strong sunlight interference signal intensity of infrared receiving tube that a certain side that c, basis are being worked is a certain group is judged the degree that sunlight disturbs that receives; Assert that sunlight disturbing effect touch-screen operate as normal promptly determines infrared radiation intensity greater than normal opposite infrared transmitting tube intensity 20% when above; Automatically switch to equidirectional another group touch-screen operating circuit; The infrared receiving tube of the side that is interfered quits work; Change the infrared receiving tube work by the opposite, the infrared transmitting tube of the side that is interfered is simultaneously started working, and the infrared transmitting tube on former opposite quits work;
D, judging infrared touch panel a certain side of living in; In the time of can not receiving the sunlight direct projection from downside and left and right sides downside like upside; The upper and lower sides of touch-screen can only arrange one group of infrared emission and receiving tube; Specifically be lower side cloth infrared transmitting tube, upper side edge cloth infrared receiving tube, this moment, touch-screen only possessed anti-sunlight direct projection interference performance from the top;
E, responsive angle are in ± 30 ° the time, and infrared receiving tube adopts the packing forms that satisfies responsive angle, to reduce the environment interference of stray light;
F, infrared receiving tube being arranged in a peripheral week on the touch screen circuitry plate; To increase the distance of infrared receiving tube to the touch-screen opening; And control gets into the size and the position of infrared receiving tube light opening; Under the situation of the straight line optical channel size that guarantees opposite infrared transmitting tube light entering infrared receiving tube, the angle that reduces to get into infrared receiving tube environment scattered beam as far as possible;
G, increase infrared spectrum wave band color filter, reduce or eliminate the outer environment stray light effects of infrared transmitting tube main peak wave band, improve the ability of the anti-environment scattered light of touch-screen at the touch-screen opening part;
H, the structure frame of infrared touch panel is applied or surface treatment, to reduce the influence of environment scattered light.
As far as single-point touches screen, the responsive angle of encapsulation can≤± 10 °.
The coated material of structure frame of described infrared touch panel must not have strong reflection or scattering power to the infrared light of 770～1200nm wave band.
Described at infrared touch panel the left and right sides or the left and right sides and up and down infrared transmitting tube and the infrared receiving tube arranged simultaneously of both sides arrange in two separate ranks; Infrared transmitting tube and infrared receiving tube in two row are staggered, and promptly the infrared receiving tube of secondary series should be between the adjacent infrared transmitting tube of first row.
Saidly be provided with infrared spectrum wave band plated film color filter to reduce or eliminate the environment stray light effects outside the infrared transmitting tube master crest wave band at the touch-screen opening part; Improve the ability of the anti-environment scattered light of touch-screen, plated film color filter wave band is infrared transmitting tube master wave-wave long value ± 20nm through scope.
Immediate current during described infrared transmitting tube scanning work is 3～10 times of rated current, and luminous intensity is not less than 300～1000mW/Sr, and the light intensity that arrives the infrared receiving tube position in irradiation is: B/D
2=1.2～4W/m
2The responsive intensity of described infrared receiving tube is 0.5～2W/m
2
The invention has the beneficial effects as follows:
The present invention has that method is simple, the starting material source extensively, does not need complicated circuit to detect the advantage of treatment technology, and suitable various sizes are especially large-sized to be exposed to the infrared touch screen products that field work under the strong sunlight environment, airborne etc. control fully.
The present invention utilizes the sunlight direct projection to have unidirectional (direct projection simultaneously is to the both sides, opposite of touch-screen) principle, adopts the infrared light path that transmits and receives of rightabout two covers, solves the problem of full angle sunlight direct projection; Because the scattered beam intensity that causes of strong sunlight cooperates the additive method of having taked on method of the present invention or the market can effectively solve the scattered light interference problem that strong sunlight causes much smaller than the radiation intensity of direct light in most cases.
It is simple that the present invention has principle, can be effectively accepts the direct projection of strong sunlight and surround lighting scattering condition reason operate as normal that direct sunlight causes and can not cause the inefficacy or the maloperation of infrared touch panel at full angle.
Description of drawings
Fig. 1 is the basic light channel structure of the present invention.
Fig. 2 is different arrangement modes or circuit configuration version figure.Fig. 2 a mode is infrared transmitting tube and infrared receiving tube cross arrangement; Fig. 2 b mode is infrared transmitting tube and infrared receiving tube line spread; Fig. 2 c mode is to arrange infrared transmitting tube and infrared receiving tube respectively with the two-tier circuit plate;
Fig. 3 be confirm sunlight can not be on a certain direction a kind of simplified design scheme during direct projection, diagram is a kind of simplified design scheme that sunlight can not be when downside gets into touch-screen.
Fig. 4 is a part other technologies measure design diagram of eliminating the scattered light disturbing effect that strong sunlight causes.
Among the figure: 1, infrared transmitting tube; 2, infrared receiving tube; 3, touch screen circuitry plate; 4, waveband infrared color filter; 5, touch screen structure framework;
Fig. 5 is a touch-screen opening part infrared spectrum wave band color filter mounting structure synoptic diagram of the present invention;
Fig. 5 a is one of infrared spectrum wave band color filter mounting structure synoptic diagram, and Fig. 5 b is two of an infrared spectrum wave band color filter mounting structure synoptic diagram.
Embodiment
With regard to structure accompanying drawing and embodiment the present invention is further described below.
Shown in Fig. 1-5.
The method that a kind of anti-strong sunlight of infrared touch panel disturbs, it may further comprise the steps
1, in the left and right sides of the circuit board 3 of infrared touch panel or the left and right sides and up and down both sides all adopt arrange infrared transmitting tube 1 and infrared receiving tube 2 simultaneously, both are staggered; Like Fig. 1.
As can be seen from Figure 1, about or up and down respectively there is infrared pipe 1 and the infrared receiving tube 2 penetrated both sides.For ability and the need of work of touch-screen own that improves anti-ambient light interference; During each power valve scanning work; The immediate current of infrared transmitting tube amplifies 3～10 times than rated current; Luminous intensity B can reach 300～1000mW/Sr intensity, and the light intensity of (like 500mm) arrival infrared receiving tube position is after shining certain distance D: B/D
2=1.2～4W/m
2, nonetheless, the relative sunlight of this light intensity is at the total light intensity 20～80W/m of 770 nm to the 1200nm wave band
2Much smaller times, the responsive intensity of general simultaneously pairing infrared receiving tube is 0.5～2W/m
2So in a single day infrared receiving tube receives the sunlight direct projection will be saturated, can't receive the infrared scan signal of differentiation from the touch-screen infrared transmitting tube, also just can't accomplish the touch location judgement.
2, infrared transmitting tube 1 and infrared receiving tube 2 are arranged by mode shown in Figure 2:
Infrared emission or receiving tube that Fig. 2 a mode is arranged than the same locational space of Fig. 2 b mode are many, so resolution is wanted height.Fig. 2 c mode is to arrange with the two-tier circuit plate, cloth infrared transmitting tube on a certain side one layer circuit board of relative touch-screen, cloth infrared receiving tube on another layer circuit board; Or be equivalent to have only the method for designing of infrared transmitting tube or infrared receiving tube oppositely to be combined into the form that one-sided existing infrared transmitting tube of the present invention has infrared receiving tube again on two common one-sided limits.
3, definite sunlight can only from side direction irradiation touch-screen, and can not be when touch-screen be advanced in direct projection from lower side, a touch-screen upper side edge cloth infrared receiving tube 2, a downside limit cloth infrared transmitting tube 1 gets final product; Like the left and right sides of Fig. 3 infrared touch panel all arranged infrared transmitting tube 1 and infrared receiving tube 2, and arrange respectively infrared transmitting tube 1 or infrared receiving tube 2 of both sides up and down;
4, eliminating the scattered light disturbing effect that strong sunlight causes can realize through following measure:
(1) reduces the scattered light that the sunlight direct projection causes and form, reduce responsive angle infrared light passage that the environment spurious rays gets into infrared receiving tube and be the gordian technique measure of eliminating the scattered light disturbing effect that sunlight causes;
(2) the structure frame coating material of infrared touch panel must not have strong reflection or scattering power to the infrared light of 770～1200nm wave band; Adopt antiradar reflectivity and scattered power coated materials (like the amino flat paint of black etc.) as far as possible; Also can reach identical effect through the method for surface treatment (handling like the aluminium alloy black oxidation), purpose is the formation that reduces the environment scattered light.
(3) adopt packing forms responsive in the certain angle scope, reducing the environment interference of stray light, this sensitivity angle generally is controlled at ± 30 ° in (± 30 ° of expressions up and down or about 30 degree, be symmetrically distributed along the axis of infrared receiving tube).Can select littler responsive angle to the single-point touches screen, as≤± 10 °.This takes into full account when in design, selecting the infrared receiving tube of suitable encapsulation.
(4) infrared receiving tube being arranged in a peripheral week on the touch screen circuitry plate; To increase the distance L of infrared receiving tube to the touch-screen opening; And control gets into the size H and the position of infrared receiving tube light opening; Guaranteeing that opposite infrared transmitting tube light gets under the straight line optical channel situation of infrared receiving tube, the angle that reduces to get into infrared receiving tube environment scattered beam is like Fig. 4.
(5) increase infrared spectrum wave band color filter at the touch-screen opening, reduce or eliminate the outer environment stray light effects of infrared transmitting tube master crest wave band, improve the ability of the anti-environment scattered light of touch-screen.Long like touch-screen infrared transmitting tube master wave-wave is 940nm, and design plated film color filter wave band is 940 ± 20nm through scope, just can eliminate the interference of 770～920,960～1200 nm wavelength infrared band environment parasitic lights to infrared receiving tube.The installation of infrared spectrum wave band color filter can have Fig. 5 a, two kinds of forms of b, like Fig. 5.
Know according to the applicant; Both sides were all adopted many infrared transmitting tubes and infrared receiving tube simultaneously about the left and right sides of the infrared touch panel in the employing foregoing invention content or the left and right sides reached at present; About, about all be equipped with two groups of infrared emission and infrared receiving tube, the mode of automatic switchover work solves the technology that the strong sunlight direct projection disturbs and does not appear in the newspapers as yet when receiving the sunlight direct projection.
Through method of the present invention, can accept the direct projection of strong sunlight and the surround lighting scattering that direct sunlight causes at full angle, and can not cause the inefficacy or the maloperation of infrared touch panel.
Details are as follows:
As shown in Figure 1, the present invention in the left and right sides of infrared touch panel or the left and right sides and up and down both sides all adopt infrared transmitting tube and infrared receiving tube simultaneously, both are staggered; With about or infrared transmitting tube and the opposite infrared receiving tube of going up next side as one group; Organize circuit with the infrared receiving tube of homonymy and the infrared transmitting tube on opposite as another; Under the drive controlling of touch-screen total control circuit plate, can touch testing respectively; And detect the infrared light intensity of each side infrared receiving tube impression; Differentiate infrared radiation intensity infrared transmitting tube intensity much larger than normal opposite the time (increasing more than 20%) than normal intensity, just automatically switch to another corresponding group circuit; The infrared receiving tube of the side that promptly is interfered quits work, and changes the infrared receiving tube work by the opposite, and the infrared transmitting tube of the side that is interfered is simultaneously started working, and the infrared transmitting tube on former opposite quits work.
Infrared receiving tube light path open height H and infrared transmitting tube working current designing and calculating:
Infrared receiving tube light path open height H should be suitable with the thickness of the diameter of infrared receiving tube collector lens or infrared receiving tube, should not be too big, and like Fig. 4.
The infrared transmitting tube working current should guarantee to be generally 1.5 to 2 times in farthest the infrared receiving tube position infrared intensity specified responsive intensity greater than infrared receiving tube:
Like the specified responsive intensity of the 950nm of the FSH3015FA of OSRAM company infrared receiving tube is 1W/m
2, radiation intensity was 0.40W/Sr when SFH4045V infrared transmitting tube immediate current was 500mA, infrared intensity was 0.4/0.5 when distance B was 0.5m
2=1.6 W/m
2, on the distance of 0.5m, can be used as the matched pair transistor of FSH3015FA infrared receiving tube;
Confirming of the arrangement pitches of infrared receiving tube and infrared transmitting tube:
Touch the requirement of resolution and the parameter that touch-screen detects sub-circuit according to touch-screen, confirm every side infrared receiving tube or infrared transmitting tube arrangement pitches, like resolution requirement 2.5 * 2.5mm.The parameter that touch-screen detects sub-circuit is 4 (segmenting 4 times), and then arrangement pitches is 2.5mm * 4 to the maximum, and promptly 10mm is 6mm if design the spacing of arranging, and then resolution is about 6mm/4=1.5 mm.
The design alternative of color filter:
Long like touch-screen infrared transmitting tube master wave-wave is 940nm, and design plated film color filter wave band is 940 ± 20nm through scope; Or transmitance is higher near selecting 940nm, and the absorption-type color filter that 920nm is following, the above transmitance of 960nm is lower.
The present invention does not detail part and can solve with reference to disclosed other infrared touch panel designing technique designs.
Claims (6)
1. the method disturbed of the anti-strong sunlight of an infrared touch panel is characterized in that it may further comprise the steps:
A, in the left and right sides of infrared touch panel or the left and right sides and up and down both sides arrange many infrared transmitting tubes and infrared receiving tube simultaneously, both are staggered;
B, the left and right sides or up and down the infrared receiving tube on any side infrared transmitting tube and the corresponding opposite of both sides as one group of touch-screen operating circuit; The infrared receiving tube of homonymy is organized touch-screen operating circuit operation detection touch signal respectively with the infrared transmitting tube on corresponding opposite as another; Differentiate touch point position, accomplish the touch measuring ability of infrared touch panel in conjunction with touch screen control circuit;
The detected strong sunlight interference signal intensity of infrared receiving tube that a certain side that c, basis are being worked is a certain group is judged the degree that sunlight disturbs that receives; Assert that sunlight disturbing effect touch-screen operate as normal promptly determines infrared radiation intensity greater than normal opposite infrared transmitting tube intensity 20% when above; Automatically switch to equidirectional another group touch-screen operating circuit; The infrared receiving tube of the side that is interfered quits work; Change the infrared receiving tube work by the opposite, the infrared transmitting tube of the side that is interfered is simultaneously started working, and the infrared transmitting tube on former opposite quits work;
D, judging infrared touch panel a certain side of living in; In the time of can not receiving the sunlight direct projection from downside and left and right sides downside like upside; The upper and lower sides of touch-screen can only arrange one group of infrared emission and receiving tube; Specifically be lower side cloth infrared transmitting tube, upper side edge cloth infrared receiving tube, this moment, touch-screen only possessed anti-sunlight direct projection interference performance from the top;
E, responsive angle are in ± 30 ° the time, and infrared receiving tube adopts the packing forms that satisfies responsive angle, to reduce the environment interference of stray light;
F, infrared receiving tube being arranged in a peripheral week on the touch screen circuitry plate; To increase the distance of infrared receiving tube to the touch-screen opening; And control gets into the size and the position of infrared receiving tube light opening; Under the situation of the straight line optical channel size that guarantees opposite infrared transmitting tube light entering infrared receiving tube, the angle that reduces to get into infrared receiving tube environment scattered beam as far as possible;
G, increase infrared spectrum wave band color filter, reduce or eliminate the outer environment stray light effects of infrared transmitting tube main peak wave band, improve the ability of the anti-environment scattered light of touch-screen at the touch-screen opening part;
H, the structure frame of infrared touch panel is applied or surface treatment, to reduce the influence of environment scattered light.
2. according to utilizing the described method of claim 1, it is characterized in that as far as the single-point touches screen responsive angle≤± 10 of encapsulation °.
3. according to utilizing the described method of claim 1, the coated material of structure frame that it is characterized in that described infrared touch panel must not have strong reflection or scattering power to the infrared light of 770～1200nm wave band.
4. according to utilizing the described method of claim 1; It is characterized in that described at infrared touch panel the left and right sides or the left and right sides and up and down infrared transmitting tube and the infrared receiving tube arranged simultaneously of both sides arrange in two separate ranks; Infrared transmitting tube and infrared receiving tube in two row are staggered, and promptly the infrared receiving tube of secondary series should be between the adjacent infrared transmitting tube of first row.
5. according to utilizing the described method of claim 1; It is characterized in that saidly being provided with infrared spectrum wave band plated film color filter to reduce or eliminate the environment stray light effects outside the infrared transmitting tube master crest wave band at the touch-screen opening part; Improve the ability of the anti-environment scattered light of touch-screen, plated film color filter wave band is infrared transmitting tube master wave-wave long value ± 20nm through scope.
6. according to utilizing the described method of claim 1; Immediate current when it is characterized in that described infrared transmitting tube scanning work is 3～10 times of rated current; Luminous intensity is not less than 300～1000mW/Sr, and the light intensity that arrives the infrared receiving tube position in irradiation is: B/D
2=1.2～4W/m
2The responsive intensity of described infrared receiving tube is 0.5～2W/m
2
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| CN201210056437.8A CN102622139B (en) | 2012-03-06 | 2012-03-06 | Strong sunshine interference-resisting method for infrared touch screen |
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|---|---|---|---|
| CN201210056437.8A CN102622139B (en) | 2012-03-06 | 2012-03-06 | Strong sunshine interference-resisting method for infrared touch screen |
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| CN105094455A (en) * | 2014-05-19 | 2015-11-25 | 上海沐泽信息技术有限公司 | Device and method for improving strong light interference resistance of infrared touch screen |
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| CN105487225B (en) * | 2014-09-24 | 2019-03-22 | 友达光电股份有限公司 | Optical devices and its optical scanning method |
| CN105487225A (en) * | 2014-09-24 | 2016-04-13 | 友达光电股份有限公司 | Optical device and optical scanning method thereof |
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| CN105975130A (en) * | 2016-05-04 | 2016-09-28 | 刘其锋 | Redundancy technology of touch display screen based on plurality of groups of touch units |
| CN107168590A (en) * | 2017-06-30 | 2017-09-15 | 成都成电光信科技股份有限公司 | A kind of touch-screen surface-mount type combined type infrared tube |
| CN110737367A (en) * | 2019-09-17 | 2020-01-31 | 深圳市凯健奥达科技有限公司 | infrared touch screen and using method thereof |
| CN111833466A (en) * | 2020-07-08 | 2020-10-27 | 电子科技大学中山学院 | Parking lot access control system and control method based on separated infrared transceiving |
| CN111949163A (en) * | 2020-08-19 | 2020-11-17 | 中航华东光电有限公司 | Infrared touch screen capable of achieving night vision compatibility |
| CN112667113A (en) * | 2021-02-23 | 2021-04-16 | 中航华东光电有限公司 | High-precision infrared touch screen |
| CN112667113B (en) * | 2021-02-23 | 2023-02-10 | 中航华东光电有限公司 | High-precision infrared touch screen |
| CN113551598A (en) * | 2021-07-20 | 2021-10-26 | 钛玛科（北京）工业科技有限公司 | Infrared wide sensor detection device and position detection method of shielding object |
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